CVE-2020-3222

What it is

A vulnerability in the web-based user interface (web UI) of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to bypass access control restrictions on an affected device. The vulnerability is due to the presence of a proxy service at a specific endpoint of the web UI. An attacker could exploit this vulnerability by connecting to the proxy service. An exploit could allow the attacker to bypass access restrictions on the network by proxying their access request through the management network of the affected device. As the proxy is reached over the management virtual routing and forwarding (VRF), this could reduce the effectiveness of the bypass.

At a glance

Exploitability

Can be exploited from the same network segment without logging in. Limited direct impact.

Exploit odds

0.4% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2020-06-03 18:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:17 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.4% in the next 30 days (EPSS).
• Severity: 4.3 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2020-06-03 18:15 UTC

Last modified

2026-06-17 03:17 UTC

Exploit probability

0.4% · EPSS, next 30 days

Weakness

CWE-17

Record status

Modified

Affected

• Cisco iOS Xe 16.10.1
• Cisco iOS Xe 16.10.1a
• Cisco iOS Xe 16.10.1b
• Cisco iOS Xe 16.10.1c
• Cisco iOS Xe 16.10.1d
• Cisco iOS Xe 16.10.1e
• Cisco iOS Xe 16.10.1f
• Cisco iOS Xe 16.10.1g

Attack profile CVSS 3.1 · 4.3

Attack vector

Adjacent network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2020-3222.md and follow it. Check whether this project is affected by CVE-2020-3222. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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